feat: introduce overridable l10nBaseUrl config value

public/src/modules/translator.js

@@ -2,7 +2,7 @@
 
 (function (factory) {
 	function loadClient(language, namespace) {
-		return Promise.resolve(jQuery.getJSON(config.relative_path + '/assets/language/' + language + '/' + namespace + '.json?' + config['cache-buster']));
+		return Promise.resolve(jQuery.getJSON(config.l10nBaseUrl + '/' + language + '/' + namespace + '.json?' + config['cache-buster']));
 	}
 	var warn = function () { console.warn.apply(console, arguments); };
 	if (typeof define === 'function' && define.amd) {

src/controllers/api.js

@@ -19,7 +19,8 @@ apiController.loadConfig = async function (req) {
 	let config = {
 		relative_path: nconf.get('relative_path'),
 		upload_url: nconf.get('upload_url'),
-		requireBaseUrl: nconf.get('relative_path') + '/assets/src/modules',
+		requireBaseUrl: `${nconf.get('relative_path')}/assets/src/modules`,
+		l10nBaseUrl: `${nconf.get('relative_path')}/assets/language`,
 		siteTitle: validator.escape(String(meta.config.title || meta.config.browserTitle || 'NodeBB')),
 		browserTitle: validator.escape(String(meta.config.browserTitle || meta.config.title || 'NodeBB')),
 		titleLayout: (meta.config.titleLayout || '{pageTitle} | {browserTitle}').replace(/{/g, '{').replace(/}/g, '}'),